66 



notopodial bristles are very conspicuous ; lliese setae, as iirst stated by Gravii;r, though much 

 more slender than the ncuropodial ones, are also provided with transverse laciniated fringes, 

 that liave the shape of cups, ü])en at one side, "(jui s'emboitent les iins dans les autres." Distally 

 these cups are placed closely next to each other and are closed, whereas inferiorly they are 

 opened and filled with strongly refractive granules. 



That Bylgia TheeP) should be allied to Iphione, as asserted by Darüoux-), appears 

 very dubious to me; for Jlylo-ia elcgans does not possess a facial tubercle and the antennae 

 emerge from the middle of the frontal margin of the head in stead of laterally as in Iphionc. 

 Aloreover the elytra of Jïylgia do not show an areolate structure and its dorsal bristles are 

 stouter than the ventral ones. Augener'') suggests that Bylgia is a mutilated Antino'c. 



Genus Iphionella Mc Intosh *). 



Prostomium rudimentarv, without eyes. No secondary areolation of the elytra. Notopo- 

 dial setae shorter than the neuropodial ones. Besides the usual bristles the neuropodial fascicle 

 contains dorsally some slender ones, furnished with spirally arranged rows. 



I. Iphionella ciuicx (Qtrf.). PI. XV, figs. i and 2. 



De QuatrefagES, Histoire naturelle des Annelés, vol. I, p. 270. 



Mc Intosh, Challenger-Annelida, p. 58, PI. IX, figs. 4—6, PI. XVII, fig. 3, PI. VIII a, figs. 

 7 and 8. 



Stat. loi. 6° 15' Lat. N., I20°2i' Long. E. Sulu Sea. Depth 1270 M. i specimen. 

 Stat. 297. 10° 39' Lat. S., i23°4o' Long. E. South off Rotti. Depth 520 M. i specimen. 



Length of the specimen of Stat. loi 13 mm.; its breadth (bristles included) 9 mm. 



This species, though much resembling Ipliionc Jiiuricata, di.stinguishes itself immediately 

 by its smoother, more flattened appearance and b\- the shorter dorsal bristles. Probably it is 

 a deep-sea form, for the Challenger-specimen was dredged south off Mindanao at a depth of 

 500 M. and the .Siboga-specimens were caught at 1270 and 520 M.; of the specimen from 

 Malacca Strait, brought home by Gaudichaud, we do not know the depth in which it was found. 

 Though Mc Intosh has given an accurate description of the remarquable, rudimentary head, 

 I think it not superfluous to publish a figure of it, to show in how many regards it differs 

 from that of Iphionc imiricata ; at the base of the palps an indistinct, conical organ is visible 

 (PI. XV, fig. i), that probably may be considered as a reduced antenna. The neuropodial fascicle 

 in its dorsal part besides the usual bristles contains some slender, straight setae, furnished 

 distally with spirally arranged fringes ; these bristles (PI. XV, fig. 2) seem to have been overlooked 

 by Mc Intosh. With regard to the structure of the elytra Mc Intosh has already observed that 

 the secondary areolation of the large he.xagonal areas in this species is not the same as in 

 Iphionc ninricata. Of the last-named species Willev rightly states'') "focussing through the 



1) I.es Annélidcs Polychètes des mers ile la Xouvelle-Zemble, 1S79, ?• -O7 '''■ 'ig^- '3 — '*'• 



2) loc. cit. |). 58. 



3) Polychaeten von Frans-Joseph-L.'ind: Zoölog. Anzeiger, 1913. p. 202. 



4) loc. cit. p. 58. 



5) loc. cit. p. 247. 



